It's clear that they are looking at this to be a big seller. It should have some decent capabilities against stealthy aircraft, and it has good anti-cruise missile and anti-tactical ballistic missile capabilities.
Considering the range of the system (over 400km), it would be expected that it would be capable of engaging low radar cross section targets at a much shorter range.
Given that a conventional bomber would have a radar cross section in the 10m2 range, and detection range a function of 4th route of the RCS (i.e. a reduction of 32x in RCS will cut range by 1/2), you get potential detection ranges as follows, assuming 400km for the bomber.
Range | RCS | Type |
400 km | 10m2 | B-1, F-15 |
336 km | 5m2 | F-16 |
225 km | 1m2 | F-18E, Rafale |
189 km | 0.5 m2 | Typhoon |
48 km | 0.00200m2 | F-117 (WAG) |
40 km | 0.00100 m2 | F-35 |
23 km | 0.00010 m2 | F-22, B2 |
So you are looking at something like a 15 mile detection range against the stealthiest targets.
Update: This range is for high frequency radars. The S-400 also has a VHF radar, which would diminish the effectiveness of stealth, to some (I don't know what) degree.
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